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Interrogations au sommet / Michel Ravelet in Géomètre, n° 2129 (octobre 2015)
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Titre : Interrogations au sommet Type de document : Article/Communication Auteurs : Michel Ravelet, Auteur Année de publication : 2015 Article en page(s) : pp 6 - 9 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] altitude
[Termes IGN] Mont-Blanc, massif du
[Termes IGN] sommet (relief)Résumé : (auteur) Les résultats de la dernière campagne de mesures du Mont Blanc surprend la communauté scientifique. Retour sur cet évènement. Numéro de notice : A2015-647 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78153
in Géomètre > n° 2129 (octobre 2015) . - pp 6 - 9[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 063-2015091 RAB Revue Centre de documentation En réserve L003 Disponible Filtering Global land and surface altimetry data (GLA14) for elevation accuracy determination / Jean-Samuel Proulx-Bourque in Photogrammetric Engineering & Remote Sensing, PERS, vol 81 n° 9 (September 2015)
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Titre : Filtering Global land and surface altimetry data (GLA14) for elevation accuracy determination Type de document : Article/Communication Auteurs : Jean-Samuel Proulx-Bourque, Auteur ; Ramata Magagi, Auteur ; Norman T. O’Neill, Auteur Année de publication : 2015 Article en page(s) : pp 701 - 707 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] altitude
[Termes IGN] Canada
[Termes IGN] données altimétriques
[Termes IGN] données ICEsat
[Termes IGN] filtrage numérique d'imageRésumé : (auteur) This paper presents a filtering method for ICESat Global Land Surface Altimetry data (GLA14), which is based on indicators to detect potentially contaminated GLA14 elevation points. Potential contamination sources include attitude miscalculation, saturated echoes, equipment noise, the atmosphere, and variable elevation within footprints. For a study site located in Northern Canada, this multi-indicator filter provided a 19 percent reduction in the root mean square error for elevation, when compared to Canadian Digital Elevation Data (CDED). This result demonstrates the method’s ability to provide an improved dataset for vertical accuracy evaluation, with respect to unfiltered GLA14 data. The improvement was achieved with a rejection rate of 69 percent. However, due to the high density of the unfiltered GLA14 data over the study site, a spatially homogeneous distribution of elevation points was maintained, even after filtering. Results also showed the rejection efficiency of most indicators, as well as their complementarity. Numéro de notice : A2015-984 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.81.9.701 En ligne : https://doi.org/10.14358/PERS.81.9.701 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80265
in Photogrammetric Engineering & Remote Sensing, PERS > vol 81 n° 9 (September 2015) . - pp 701 - 707[article]Genetic differentiation of European larch along an altitudinal gradient in the French Alps / Maxime Nardin in Annals of Forest Science, vol 72 n° 5 (July 2015)
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Titre : Genetic differentiation of European larch along an altitudinal gradient in the French Alps Type de document : Article/Communication Auteurs : Maxime Nardin, Auteur ; Brigitte Musch, Auteur ; Yves Rousselle, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 517-527 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] Alpes (France)
[Termes IGN] altitude
[Termes IGN] cambium
[Termes IGN] classification de Dempster-Shafer
[Termes IGN] diversité génétique
[Termes IGN] génétique
[Termes IGN] gradient
[Termes IGN] Larix decidua
[Termes IGN] montagne
[Termes IGN] placette d'échantillonnage
[Termes IGN] variabilité génétiqueRésumé : (Auteur) Key message : Despite variable dynamics of genetic diversification at the different altitudinal levels, strong gene flow tends to standardize larch genetic diversity: the larch forest distributed along the altitudinal gradient can be regarded as a single population.
Context : While in forest tree species many studies focus on the structure of the genetic diversity at the natural range and at the forest stand levels, few studies have worked at intermediate levels like the landscape level.
Aims : We tried to determine to what degree altitude variation can affect the genetic diversity and the local structure of the genetic diversity of European larch (Larix decidua Miller) at the landscape level.
Methods : Using microsatellite markers, we determined the between- and within-plot genetic structure and the spatial genetic structure (SGS) of four altitudinal plots distributed between 1,350 and 2,300 m a.s.l. in a European larch forest located in the French Alps.
Results : A homogenous neutral genetic structure was detected along this gradient. The intensity of the SGS was found to be stronger at 2,300 m and decreased at the 2,000-m plot. It was low or non-existent at the 1,700- and 1,350-m altitudinal levels.
Conclusion : Our results suggest that the genetic structure observed at the landscape level in this European larch forest was only slightly affected by climatic variation, human activities, or historical events. However, the variation of intensity of the SGS within the altitudinal plots indicates the existence of variable genetic dynamics, despite the globally uniform genetic structure along the altitudinal gradient.Numéro de notice : A2015-413 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s13595-015-0483-8 Date de publication en ligne : 30/04/2015 En ligne : https://doi.org/10.1007/s13595-015-0483-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76903
in Annals of Forest Science > vol 72 n° 5 (July 2015) . - pp 517-527[article]Accuracy of unmodified Stokes’ integration in the R-C-R procedure for geoid computation / Zahra Ismaïl in Journal of applied geodesy, vol 9 n° 2 (June 2015)
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Titre : Accuracy of unmodified Stokes’ integration in the R-C-R procedure for geoid computation Type de document : Article/Communication Auteurs : Zahra Ismaïl, Auteur ; Olivier Jamet , Auteur Année de publication : 2015 Projets : 3-projet - voir note / Article en page(s) : pp 112 - 122 Note générale : bibliographie
This work was supported by a doctoral scholarship from the University of Tichrine, Latakia, Syria.Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altitude
[Termes IGN] anomalie de pesanteur
[Termes IGN] Earth Gravity Model 2008
[Termes IGN] géoïde
[Termes IGN] GravSoft
[Termes IGN] harmonique sphérique
[Termes IGN] intégrale de Stokes
[Termes IGN] montagneRésumé : (auteur) Geoid determinations by the Remove-Compute-Restore (R-C-R) technique involves the application of Stokes’ integral on reduced gravity anomalies. Numerical Stokes’ integration produces an error depending on the choice of the integration radius, grid resolution and Stokes’ kernel function.
In this work, we aim to evaluate the accuracy of Stokes’ integral through a study on synthetic gravitational signals derived from EGM2008 on three different landscape areas with respect to the size of the integration domain and the resolution of the anomaly grid. The influence of the integration radius was studied earlier by several authors. Using real data, they found that the choice of relatively small radii (less than 1°) enables to reach an optimal accuracy. We observe a general behaviour coherent with these earlier studies. On the other hand, we notice that increasing the integration radius up to 2° or 2.5° might bring significantly better results. We note that, unlike the smallest radius corresponding to a local minimum of the error curve, the optimal radius in the range 0° to 6° depends on the terrain characteristics. We also find that the high frequencies, from degree 600, improve continuously with the integration radius in both semi-mountainous and mountain areas.
Finally, we note that the relative error of the computed geoid heights depends weakly on the anomaly spherical harmonic degree in the range from degree 200 to 2000. It remains greater than 10 % for any integration radii up to 6°. This result tends to prove that a one centimetre accuracy cannot be reached in semi-mountainous and mountainous regions with the unmodified Stokes’ kernel.Numéro de notice : A2015-391 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jag-2014-0026 En ligne : http://dx.oi.org/10.1515/jag-2014-0026 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76860
in Journal of applied geodesy > vol 9 n° 2 (June 2015) . - pp 112 - 122[article]Development of new hybrid geoid model for Japan, "GSIGEO2011" / Basara Miyahara in Bulletin of the GeoSpatial Information authority of Japan, vol 62 (December 2014)
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Titre : Development of new hybrid geoid model for Japan, "GSIGEO2011" Type de document : Article/Communication Auteurs : Basara Miyahara, Auteur ; Tokuro Kodama, Auteur ; Yuki Kuroishi, Auteur Année de publication : 2014 Article en page(s) : pp 11 - 20 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altitude orthométrique
[Termes IGN] collocation par moindres carrés
[Termes IGN] géoïde gravimétrique
[Termes IGN] géoïde local
[Termes IGN] nivellement
[Termes IGN] positionnement par GNSSRésumé : (auteur) We have developed a new hybrid geoid model of Japan, “GSIGEO2011”, which was made publicly available on April 1, 2014. The model was created in such a way that a high-resolution gravimetric geoid model for Japan, “JGEOID2008” was fitted to GNSS/leveling geoid undulations at 971 sites by the Least-Squares Collocation method. The model reproduces geoid heights at the GNSS/leveling sites with the consistency of a standard deviation of 1.8 cm. By utilizing the model to convert GNSS-derived three-dimensional positions to orthometric heights, GNSS survey can determine orthometric heights at the same precision as third-order leveling surveys. Orthometric height determination by GNSS surveying has been applicable in public surveys as alternative to third-order leveling in Japan since April 1 2014. Numéro de notice : A2014-706 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000099005.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75516
in Bulletin of the GeoSpatial Information authority of Japan > vol 62 (December 2014) . - pp 11 - 20[article]PermalinkEssai sur la découverte du g et son incidence en topographie / Paul Courbon in XYZ, n° 139 (juin - août 2014)PermalinkMont Blanc : peu de changement / Anonyme in Géomètre, n° 2107 (octobre 2013)PermalinkCIRCE RHONE : mise en place d'une grille de transformation altimétrique entre les altitudes orthométriques (NGF/Lallemand) et normales (NGF/IGN69) / Paul-Henri Faure in XYZ, n° 134 (mars - mai 2013)PermalinkGlobal height system unification with GOCE: a simulation study on the indirect bias term in the GBVP approach / C. Gerlach in Journal of geodesy, vol 87 n° 1 (January 2013)PermalinkPermalinkThe height datum problem and the role of satellite gravity models / A. Gatti in Journal of geodesy, vol 87 n° 1 (January 2013)PermalinkAnalyse en relativité d’échelle du bassin versant du Gardon (Gard, France) : Étude de la variation de la dimension fractale en fonction de l’altitude et de l’échelle / L. Nottale in Revue internationale de géomatique, vol 22 n° 1 (mars - mai 2012)PermalinkPermalinkSingular spectrum analysis of global mean sea level variations / S. Khelifa in Bulletin des sciences géographiques, n° 26 (octobre 2011)PermalinkLe toit de l'Europe sous surveillance / Anonyme in Géomètre, n° 2085 (octobre 2011)PermalinkUtilisation de la technique du nivellement par GPS pour l'élaboration des surfaces de conversions altimétriques / S. Medjahed in Bulletin des sciences géographiques, n° 26 (octobre 2011)PermalinkSimulation study of the influence of the ionospheric layer height in the thin layer ionospheric model / C. Brunini in Journal of geodesy, vol 85 n° 9 (September 2011)PermalinkOn improving precision of GPS-derived height times series at GEONET stations / H. Munekane in Bulletin of the GeoSpatial Information authority of Japan, vol 58 (December 2010)PermalinkThe combination of GNSS-levelling data and gravimetric (quasi-) geoid heights in the presence of noise / R. Klees in Journal of geodesy, vol 84 n° 12 (December 2010)PermalinkThe effect of EGM2008-based normal, normal-orthometric and Helmert orthometric height systems on the Australian levelling network / M. Filmer in Journal of geodesy, vol 84 n° 8 (August 2010)PermalinkInteger least-squares theory for the GNSS compass / Peter J.G. Teunissen in Journal of geodesy, vol 84 n° 7 (July 2010)PermalinkAssessing the accuracy of GEOID03 and GEOID09 in Connecticut / Thomas H. Meyer in SaLIS Surveying and land information science, vol 70 n° 2 (Summer 2010)PermalinkEstablishment of an empirical Geoid Model for a small geographic area: a case study of Port Harcourt, Nigeria / J. Olaleye in SaLIS Surveying and land information science, vol 70 n° 1 (Spring 2010)PermalinkRelation between the Italian and European height systems / Alessandro Caporali in Bulletin of geodesy and geomatics BGG, vol 69 n° 1 (March 2010)PermalinkA bias-free geodetic boundary value problem approach to height datum unification / Alireza A. Ardalan in Journal of geodesy, vol 84 n° 2 (February 2010)PermalinkNuevo ajuste de la Red Geodésica de Espana (ROI) en altitudes ortométricas / José Antonio Sanchez Sobrino in Topografia y cartografia, vol 27 n° 156 (01/01/2010)PermalinkEl nuevo modelo de Geoide para España EGM08-REDNAP / José Antonio Sanchez Sobrino in Topografia y cartografia, vol 26 n° 155 (01/12/2009)PermalinkGénération de modèles numériques de terrain par fusion de données lidar et image / Frédéric Bretar in Traitement du signal, vol 26 n° 2 (2009-2)PermalinkCalibrage de quelques modèles de géoide dans la zone des collines Albanes (Rome) / Valerio Baiocchi in Géomatique expert, n° 66 (01/01/2009)PermalinkDéfinition de la nouvelle mensuration nationale de la Suisse 'MN95'. 13ème partie Introduction du cadre de référence 'MN95' dans l'infrastructure nationale de données géographiques / B. Vogel (2009)PermalinkWater vapour intercomparison effort in the frame of the Convective and Orographically‐ induced Precipitation Study / Rohini Bhawar (2009)PermalinkOfficial GNSS-derived vertical orthometric height control network / G. Steinberg in SaLIS Surveying and land information science, vol 68 n° 1 (March 2008)PermalinkGlobal elevation ancillary data for land-use classification using granular neural networks / D. Stathakis in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 1 (January 2008)PermalinkSilver fir (abies alba mill.) in limiting ecological conditions / Jiri Sindelar in Communicationes Instituti Forestalis Bohemicae, vol 24 (2008)PermalinkAugmentation of indoor positioning systems with a barometric pressure sensor for direct altitude determination in a multi-storey building / Guenther Retscher in Cartography and Geographic Information Science, vol 34 n° 4 (October 2007)PermalinkFilling the voids in the SRTM elevation model: a tin-based delta surface approach / E. Luedeling in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 4 (September 2007)PermalinkPractical geodesy: part 3 The geoid / Huibert-Jan Lekkerkerk in Geoinformatics, vol 10 n° 4 (01/06/2007)PermalinkOfficial geoid undulations model: substitute for nationwide orthometric control network / G. Steinberg in GIM international, vol 21 n° 2 (February 2007)PermalinkAufbau der neuen Landesvermessung der Schweiz 'LV95'. Teil 12 Landeshöhennetz 'LHN95' / A. Schlatter (2007)PermalinkPermalinkQuelques définitions sur les systèmes de références et de coordonnées [diaporama] / Perrine Rouffiac (2007)Permalink3D physical versus empirical models for HR sensor orientation and elevation extraction: examples with Ikonos and Quickbird / Thierry Toutin in Revue Française de Photogrammétrie et de Télédétection, n° 184 (Décembre 2006)PermalinkConversion altimétrique des hauteurs ellipsoïdales par GPS / A. Zeggai in XYZ, n° 109 (décembre 2006 - février 2007)PermalinkA new technique to determine geoid and orthometric heights from satellite positioning and geopotential numbers / Lard Erik Sjöberg in Journal of geodesy, vol 80 n° 6 (September 2006)PermalinkWhat does height really mean? Part 3 height systems / Thomas H. Meyer in Surveying and land information science, vol 66 n° 2 (01/09/2006)PermalinkDetermination of postglacial land uplift in Fennoscandia from leveling, tide-gauges and continuous GPS stations using least squares collocation / O. Vestol in Journal of geodesy, vol 80 n° 5 (August 2006)PermalinkThe orthometric height and the holonomity problem / Fernando Sanso in Journal of geodesy, vol 80 n° 5 (August 2006)PermalinkCloud base heights retrieved during night-time conditions with MODIS data / K. Hutchinson in International Journal of Remote Sensing IJRS, vol 27 n°12-13-14 (July 2006)PermalinkEffect of the STRM global DEM on the determination of a high-resolution geoid model: A case study in Iran / R. Kiamehr in Journal of geodesy, vol 79 n° 9 (December 2005)Permalink